const mongoose = require('mongoose');

module.exports = new Promise((resolve,reject)=>{
    mongoose.connect('mongodb://localhost:27017/student_2203',{useNewUrlParser:true,useUnifiedTopology:true,useCreateIndex:true});

    mongoose.connection.once('open',err=>{
        if(!err){
            console.log('数据库连接成功！！');
            resolve();
        }else{
            console.log(err);
            reject(err);
        } 
    })
})